Monochamus alternatus, the Japanese pine sawyer, is a species of beetle in the family Cerambycidae. It was described by Frederick William Hope in 1842. It is known from Hong Kong, Vietnam, Laos, North Korea, South Korea, Japan, China, and Taiwan. It feeds on Pinus banksiana, Abies firma, Pinus armandii, Pinus massoniana, Pinus yunnanensis, and Pinus densiflora. It serves as a vector for the nematode Bursaphelenchus xylophilus.

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